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more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
2023-01-29 21:20:58 +01:00
#!/usr/bin/env python3
Bump Copyright to 2025
2025-01-10 11:35:44 +01:00
# Copyright 2010-2025 Google LLC
task allocation problem from a blog
2018-09-09 15:20:46 +02:00
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
use black on examples/python
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polish task allocation problem
2018-09-09 18:08:31 +02:00
"""CP-SAT model for task allocation problem.
task allocation problem from a blog
2018-09-09 15:20:46 +02:00
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
2023-01-29 21:20:58 +01:00
see http://yetanothermathprogrammingconsultant.blogspot.com/2018/09/minizinc-
cpsat-vs-mip.html
"""
ported most official python cp examples to CP-SAT; cleaned up a few of them
2018-11-19 20:42:23 -08:00
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
2023-01-29 21:20:58 +01:00
from typing import Sequence
from absl import app
task allocation problem from a blog
2018-09-09 15:20:46 +02:00
from ortools.sat.python import cp_model
add new python example; add simple typing annotations
2024-07-23 14:07:41 +02:00
def task_allocation_sat() -> None:
polish task allocation problem
2018-09-09 18:08:31 +02:00
"""Solves the task allocation problem."""
# Availability matrix.
use black on examples/python
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available = [
example: Fix python formating
2023-07-13 14:28:36 +02:00
# fmt:off
examples: cleanup python samples
2023-07-18 13:55:36 +02:00
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],
example: Fix python formating
2023-07-13 14:28:36 +02:00
# fmt:on
use black on examples/python
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]
polish task allocation problem
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ntasks = len(available)
nslots = len(available[0])
# sets
all_tasks = range(ntasks)
all_slots = range(nslots)
# max tasks per time slot
capacity = 3
# Model
model = cp_model.CpModel()
assign = {}
for task in all_tasks:
for slot in all_slots:
polish python examples: use string interpolations; remove many mypy warnings
2024-07-25 15:46:57 -07:00
assign[(task, slot)] = model.new_bool_var(f"x[{task}][{slot}]")
[CP-SAT] convert to PEP8 convention
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count = model.new_int_var(0, nslots, "count")
polish python examples: use string interpolations; remove many mypy warnings
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slot_used = [model.new_bool_var(f"slot_used[{s}]") for s in all_slots]
polish task allocation problem
2018-09-09 18:08:31 +02:00
for task in all_tasks:
[CP-SAT] convert to PEP8 convention
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model.add(
use black on examples/python
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sum(
assign[(task, slot)] for slot in all_slots if available[task][slot] == 1
)
== 1
)
polish task allocation problem
2018-09-09 18:08:31 +02:00
for slot in all_slots:
[CP-SAT] convert to PEP8 convention
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model.add(
use black on examples/python
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sum(
assign[(task, slot)] for task in all_tasks if available[task][slot] == 1
)
<= capacity
)
[CP-SAT] convert to PEP8 convention
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model.add_bool_or(
use black on examples/python
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[assign[(task, slot)] for task in all_tasks if available[task][slot] == 1]
[CP-SAT] convert to PEP8 convention
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).only_enforce_if(slot_used[slot])
polish task allocation problem
2018-09-09 18:08:31 +02:00
for task in all_tasks:
if available[task][slot] == 1:
[CP-SAT] add ~operator for the logical negation in C++ and Python; fix a bug in C#
2023-12-15 14:10:44 +01:00
model.add_implication(~slot_used[slot], ~assign[(task, slot)])
polish task allocation problem
2018-09-09 18:08:31 +02:00
else:
[CP-SAT] convert to PEP8 convention
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model.add(assign[(task, slot)] == 0)
polish task allocation problem
2018-09-09 18:08:31 +02:00
[CP-SAT] convert to PEP8 convention
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model.add(count == sum(slot_used))
polish task allocation problem
2018-09-09 18:08:31 +02:00
# Redundant constraint. This instance is easier if we add this constraint.
[CP-SAT] convert to PEP8 convention
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# model.add(count >= (nslots + capacity - 1) // capacity)
polish task allocation problem
2018-09-09 18:08:31 +02:00
[CP-SAT] convert to PEP8 convention
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model.minimize(count)
polish task allocation problem
2018-09-09 18:08:31 +02:00
# Create a solver and solve the problem.
solver = cp_model.CpSolver()
# Uses the portfolion of heuristics.
add log
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solver.parameters.log_search_progress = True
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
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solver.parameters.num_search_workers = 16
polish python examples: use string interpolations; remove many mypy warnings
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solver.solve(model)
task allocation problem from a blog
2018-09-09 15:20:46 +02:00
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
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def main(argv: Sequence[str]) -> None:
if len(argv) > 1:
use black on examples/python
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raise app.UsageError("Too many command-line arguments.")
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
2023-01-29 21:20:58 +01:00
task_allocation_sat()
use black on examples/python
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if __name__ == "__main__":
more absl::string_view in the c++ code; sync examples/python, remove jniutils.h; move sat/python/visualization.py to sat/colab
2023-01-29 21:20:58 +01:00
app.run(main)
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